The LPS-induced neutrophil recruitment into rat air pouches is mediated by TNFa: likely macrophage origin
1997
Macrophages and TNFa in Rat Air Pouches
Sample size: 7
publication
Evidence: high
Author Information
Author(s): C-D. Arreto, C. Dumarey, M-A. Nahori, B. B. Vargaftig
Primary Institution: Institut Pasteur
Hypothesis
The study investigates the role of resident macrophages in LPS-induced neutrophil recruitment in rat air pouches.
Conclusion
Macrophages play a crucial role in LPS-induced neutrophil recruitment through the production of TNFa.
Supporting Evidence
- LPS injection induced a significant increase in neutrophil recruitment.
- Dexamethasone inhibited both neutrophil recruitment and TNFa production.
- Alveolar macrophages restored neutrophil recruitment in cycloheximide-treated rats.
- Liposome-encapsulated clodronate significantly impaired neutrophil recruitment.
- Anti-TNFa antibodies suppressed LPS-induced neutrophil recruitment.
Takeaway
When rats were given a substance that causes inflammation, special cells called macrophages helped bring in other cells to fight the inflammation.
Methodology
The study used a rat air pouch model to assess neutrophil recruitment and TNFa production after LPS injection.
Participant Demographics
Brown-Norway rats (200-250 g)
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.05
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